The Jefferson County Health Department will spray and fog downtown and the 4-H fairgrounds for mosquitoes daily throughout the next week.

The department began treating the areas last week and will continue until the end of the 4-H Fair, said Health Administrator Tammy Monroe.

The solution can be applied up to six hours before rain, and crews plan to spray every night. Monroe said the solution is not harmful to people.

Heavy rain this year has created plenty of standing water, which serves as a prime breeding ground for the insects.

Monroe said good bite prevention methods include removing objects with standing water around the home, wearing long sleeves and using bug and insect repellent.

Aside from an irritating itch, a mosquito can carry a number of viruses, including West Nile.

Last year, Jefferson County - as well as several other counties in the state - tested positive for having mosquitoes with the West Nile virus, though no human cases were reported locally.

In 2011, one Jefferson County resident was reported to have contracted West Nile.

The department sent out about 1,000 samples of mosquitoes to the Indiana Health Department for West Nile testing in late June but have yet to hear results.

The insects were trapped in areas with pooling water across the county.